How much does a garage conversion cost
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How Much Does a Garage Conversion Cost in the UK?
A standard integral garage conversion to a habitable room costs £8,000 to £20,000 depending on the size, specification, and what the space will be used for. A basic conversion is at the lower end; a full bedroom with en-suite is at the top.Garage conversion cost varies considerably depending on the current condition of the garage, the intended use of the converted space, the level of finish required, and the region of the UK. Understanding the main cost components helps homeowners budget realistically.
Basic Conversion Costs
A basic garage conversion that creates a usable habitable room, such as a study, playroom, or home gym, typically costs £8,000 to £12,000 for a standard single garage. This includes insulating the walls, floor, and roof, replacing the garage door opening with a wall and window or external door, plastering, flooring, electrical points, and basic decoration. It does not include fitted furniture or specialist finishes.
Bedroom and Living Space Conversions
Creating a bedroom requires meeting Building Regulations fire safety requirements, which typically means upgrading the door connecting the garage to the rest of the house to fire-door standard. Adding an en-suite bathroom adds plumbing costs. A complete bedroom with en-suite typically costs £15,000 to £20,000. If the conversion creates a separate studio flat with a kitchenette and bathroom, costs rise to £20,000 to £30,000 depending on specification.
Key Cost Drivers
The main factors driving conversion cost are the existing floor level relative to the house (a sunken garage floor requires raising or a step), the structural condition of the existing walls and roof, the cost of heating extension (connecting to the existing heating system), and the level of decoration and fitting finish. An old garage with a cracked slab, damp walls, and a flat felt roof in poor condition is significantly more expensive to convert to a good standard than a recently built garage in sound condition.
Building Regulations approval and a completion certificate are required for all garage conversions regardless of size. The completion certificate is essential for resale and for any mortgage valuation of the converted space. Budget approximately £500 to £1,000 for the Building Regulations application and inspection fees as part of the total conversion cost.
Summary
Basic garage conversions cost £8,000 to £12,000. Bedroom conversions cost £12,000 to £20,000. Full studio flat conversions cost £20,000 to £30,000. Key cost drivers are the existing garage condition, the intended use, fire safety requirements, and heating connection. Building Regulations approval costs approximately £500 to £1,000 and is required for all conversions.
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